Vacuum-can.



B. NORTON. VACUUM 01m APPLIOATION FILED MAY 9,, 1912.

- Patented Mar. 30

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vided VACUUM-CAN.

Specification of Letters Patent.

Patented Mair. so, 11ers.

Application filed may 9, 1912. Serial N0. 696,181.

To all whom it may concern:

Be it known that I, EDWIN N ORTON, a citizen of the United States,residing at Hamilton, Bermuda, have invented certain new and usefulImprovements in Vacuum-Cans, of which the-following is a description,reference being had to the accompanying drawing and to the figures ofreference marked thereon.

The invention relates to new and useful improvements in vacuum cans,that is, cans which are vacuumized after the cover is placed thereon andthen sealed.

An object of the invention is to provide a can which may be cheaply madewithout sacrificing in any way the strength or efficiency of the can.

In the drawing, which shows by way of illustration one embodiment of theinvention,-Figure 1 is a sectional view through the upper part of a canwith my improvements applied thereto;-Fig. 2- is a plan view of thesame; and Fig. 3 is an enlarged detail of the center portion of theshowing the same partly in perspective partly in section.

In carrying out my invention, T have proa can construction wherein thecan body and the cover may be made of uncoated or black steel. By this Imean steel which is rolled into thin sheets such as are used in makingtin plate. The surface of the steel which is to form the inside of thecan is coated with a resisting coating such as aluminum, lacquer or thelike, and the outer surface of the metal is either left in its uncoatedoxidized state, or covered with a sizing varnish. The cover is providedwith the usual perforation, through which the air is exhausted from thecan during the vacuumizing process.

In order that solder may be secured to the cover adjacent theperforation, which may be used for closing the said perforation afterthe air is exhausted in the can, I have treated the outer surface of thecan and adjacent the perforation so as to form a.

surface to which the V solder will adhere.

This treatment consists in grinding or cuttlng away the outer oroxidized surface of the cover adjacent the opening, and this cleanunoxidized surface will adhere to the older.

Referring more in detail he can consists of a body to the drawing,portion 1 which can,

is formed from the uncoated or black steel referred to. he inner surfaceof this can body is coated with aluminum or. lacquer, or some othersimilar substance. The cover 2 is, as herein shown, hermetically securedto the can body by rolling the outer edge thereof into a double seam 3,whichis the well lmown construction, and will not need furtherdescription. A suitable sealing sub stance is rolled into the scam inthe usual well known manner.

The outer faces of the can body and cover are in their ordinaryoxidizedor uncoated state, and may if desired be coated with a sizing orvarnish. The cover is provided centrally thereof with a perforation,

and around said perforation is an annular depression 5. The bottom ofthe depression 5 is ground, or otherwise treated, so as to remove theoxidized outer surface of the metal, and to leave a clean brightsurface. This surface will adhere to the solder. The depression in thecan cover is substantially filled with solder as indicated in Fig. andthe perforation through the cover is preferably made after the solder isapplied, so that the perforation extends through the solder.

After the can is filled and the cover secured thereto, the air isexhausted from the can through the perforation, and the solder is thenmelted by a suitable iron and the perforation closed. The entire can maythen be dipped in lacquer otherwise treated, if desired, to a protectivecoating.

From the above description, it will be apparent that T have provided acan wherein the metalused in the construction is the to givethereordinary black sheet steel, without the usual tin coating, andthese metal sheets may be very cheaply made and thereby the cost of ecan greatly reduced. While I have shown the cover as having a centraldepression and the solder filling the same, it will be obvious that theopening may be otherwise located and the construction varied, theessential feature being the removing of the outer oxidized surface ofthe black steel cover, so that the solder may be caused to adherethereto.

Throughout the claims, I have referred to the metal used in theconstruction of the can as black steel, it being understood that thisterm is used to designate fiat sheets or enamel, or a other metal as isusual in the construction of cans. \Vhile I have also referred to the dpression as surrounding the perforation, it will be understood that inthe construction of the can the depression is first made, and after thesolder is applied thereto, the perforation is then formed through thesolder and cover. 7

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. A vacuum can, comprising a can body, a cover therefor, adapted to behermetically secured to the can body, said cover being formed of blacksteel and having a resisting coating on its inner face, said coverhaving a portion of the outer or oxidized surface thereof removed, andhaving solder secured thereto, said solder and cover having aperforation formed therethrough, through which the'can may be placedunder vacuum.

2. A vacuum can, comprising a can body, a cover therefor, adapted to behermetically secured to the. can body, said can body and cover beingformed of black steel, and having a resisting coating on the inner facethereof, said cover having a depression formed centrally therein, theouter or oxidized surface of said depressed portion of the cover beingremoved and having solder secured thereto, said solder and'cover aving aperforation extending therethrough,.

through which the can vacuum.

3. A vacuum can comprising a can body, and a cover therefor adapted tobe hermetically secured to the can body, said can body and cover beingformed of black steel and having a coating of lacquer on the inner facethereof, said cover having a'depression formed centrally therein, dizedsurface of said depressed portion of the cover being removed and havingsolder secured thereto, said solder and cover having'a perforationextending therethrough through which the can may be placed under vacuum,said can body and cover having a coating of varnish on its outer face topre vent the black steel from oxidizing. In testimony whereof I aflix mysignature in the presence of two witnesses.

EDWIN NORTON.

may be placed under Witnesses:

A. W. NoR'roN, FBEDK M. HAAS.

the outer or oxi-

